Shield Arms Shield Arms Glock 43X/48 OEM +5 15/rd Magazine Extension Black 5/rd. IMPORTANT NOTE It is compatible with the OEM 15-round magazine only and is not compatible with OEM 10-round magazines or Shield Arms S-Series magazines.Compatible with Glock 43X and Glock 48 OEM 15-round magazines onlyNot compatible with OEM 10-round magazines or Shield Arms S-Series magazinesIncludes a plus-power replacement spring and all installation hardwareBacked by Shield Arms' lifetime warranty and Spring for Life guaranteeMagazine NOT included Specifications for Shield Arms Glock 43X/48 OEM +5 15/rd Magazine Extension Black 5/rd 9676B7A8: Manufacturer: Shield Arms Caliber: 9mm Luger Magazine Capacity: 5 Round Package Contents: Shield Arms Glock 43X/48 OEM +5 15/rd Magazine Extension Black 5/rd The Shield Arms Glock 43X / 48 +5 Magazine Extension is a precision-machined 6061 aluminum magazine extension that adds 5 rounds of capacity to the new Glock 43X and Glock 48 OEM 15-round magazine - bringing total capacity to 20 rounds. IMPORTANT NOTE It is compatible with the OEM 15-round magazine only and is not compatible with OEM 10-round magazines or Shield Arms S-Series magazines.Compatible with Glock 43X and Glock 48 OEM 15-round magazines onlyNot compatible with OEM 10-round magazines or Shield Arms S-Series magazinesIncludes a plus-power replacement spring and all installation hardwareBacked by Shield Arms' lifetime warranty and Spring for Life guaranteeMagazine NOT included G43X48-OEM15-ME-5-BLK